// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/views/examples/scroll_view_example.h"

#include "base/macros.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "ui/views/background.h"
#include "ui/views/controls/button/label_button.h"
#include "ui/views/controls/button/radio_button.h"
#include "ui/views/layout/grid_layout.h"
#include "ui/views/view.h"

using base::ASCIIToUTF16;

namespace views {
namespace examples {

    // ScrollView's content, which draws gradient color on background.
    // TODO(oshima): add child views as well.
    class ScrollViewExample::ScrollableView : public View {
    public:
        ScrollableView()
        {
            SetColor(SK_ColorRED, SK_ColorCYAN);
            AddChildView(new LabelButton(NULL, ASCIIToUTF16("Button")));
            AddChildView(new RadioButton(ASCIIToUTF16("Radio Button"), 0));
        }

        gfx::Size GetPreferredSize() const override
        {
            return gfx::Size(width(), height());
        }

        void SetColor(SkColor from, SkColor to)
        {
            set_background(Background::CreateVerticalGradientBackground(from, to));
        }

        void PlaceChildY(int index, int y)
        {
            View* view = child_at(index);
            gfx::Size size = view->GetPreferredSize();
            view->SetBounds(0, y, size.width(), size.height());
        }

        void Layout() override
        {
            PlaceChildY(0, 0);
            PlaceChildY(1, height() / 2);
            SizeToPreferredSize();
        }

    private:
        DISALLOW_COPY_AND_ASSIGN(ScrollableView);
    };

    ScrollViewExample::ScrollViewExample()
        : ExampleBase("Scroll View")
    {
    }

    ScrollViewExample::~ScrollViewExample()
    {
    }

    void ScrollViewExample::CreateExampleView(View* container)
    {
        wide_ = new LabelButton(this, ASCIIToUTF16("Wide"));
        tall_ = new LabelButton(this, ASCIIToUTF16("Tall"));
        big_square_ = new LabelButton(this, ASCIIToUTF16("Big Square"));
        small_square_ = new LabelButton(this, ASCIIToUTF16("Small Square"));
        scroll_to_ = new LabelButton(this, ASCIIToUTF16("Scroll to"));
        scrollable_ = new ScrollableView();
        scroll_view_ = new ScrollView();
        scroll_view_->SetContents(scrollable_);
        scrollable_->SetBounds(0, 0, 1000, 100);
        scrollable_->SetColor(SK_ColorYELLOW, SK_ColorCYAN);

        GridLayout* layout = new GridLayout(container);
        container->SetLayoutManager(layout);

        // Add scroll view.
        ColumnSet* column_set = layout->AddColumnSet(0);
        column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 1,
            GridLayout::USE_PREF, 0, 0);
        layout->StartRow(1, 0);
        layout->AddView(scroll_view_);

        // Add control buttons.
        column_set = layout->AddColumnSet(1);
        for (int i = 0; i < 5; i++) {
            column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 1,
                GridLayout::USE_PREF, 0, 0);
        }
        layout->StartRow(0, 1);
        layout->AddView(wide_);
        layout->AddView(tall_);
        layout->AddView(big_square_);
        layout->AddView(small_square_);
        layout->AddView(scroll_to_);
    }

    void ScrollViewExample::ButtonPressed(Button* sender, const ui::Event& event)
    {
        if (sender == wide_) {
            scrollable_->SetBounds(0, 0, 1000, 100);
            scrollable_->SetColor(SK_ColorYELLOW, SK_ColorCYAN);
        } else if (sender == tall_) {
            scrollable_->SetBounds(0, 0, 100, 1000);
            scrollable_->SetColor(SK_ColorRED, SK_ColorCYAN);
        } else if (sender == big_square_) {
            scrollable_->SetBounds(0, 0, 1000, 1000);
            scrollable_->SetColor(SK_ColorRED, SK_ColorGREEN);
        } else if (sender == small_square_) {
            scrollable_->SetBounds(0, 0, 100, 100);
            scrollable_->SetColor(SK_ColorYELLOW, SK_ColorGREEN);
        } else if (sender == scroll_to_) {
            scroll_view_->contents()->ScrollRectToVisible(
                gfx::Rect(20, 500, 1000, 500));
        }
        scroll_view_->Layout();
    }

} // namespace examples
} // namespace views
